It there some way to cancel a sent email so as to stop the messages I keep getting over and over like the one below:
This is an automatically generated Delivery Status Notification.
Delivery to the following recipients is still underway after 49.9 hour(s):
Will keep trying and contact you if the message can't be delivered permanently.
Reporting-MTA: dns; qmta01.emeryville.ca.mail.comcast.net [22.214.171.124]
Received-From-MTA: dns; omta03.emeryville.ca.mail.comcast.net [126.96.36.199]
Arrival-Date: Fri, 12 Mar 2010 18:28:11 +0000
Final-recipient: rfc822; email@example.com
Last-attempt-Date: Sun, 14 Mar 2010 20:22:25 +0000
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